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Chemical History of Molecules in Circumstellar Disks

Published online by Cambridge University Press:  21 December 2011

Ruud Visser ,
Ewine F. van Dishoeck  and
Steven D. Doty
Ruud Visser
Affiliation:
Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1042, USA email: visserr@umich.edu Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, the Netherlands
Ewine F. van Dishoeck
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, the Netherlands Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany
Steven D. Doty
Affiliation:
Department of Physics and Astronomy, Denison University, Granville, OH 43023, USA
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Abstract

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The chemical composition of a protoplanetary disk is determined not only by in situ chemical processes during the disk phase, but also by the history of the gas and dust before it accreted from the natal envelope. In order to understand the disk's chemical composition at the time of planet formation, especially in the midplane, one has to go back in time and retrace the chemistry to the molecular cloud that collapsed to form the disk and the central star. Here we present a new astrochemical model that aims to do just that. The model follows the core collapse and disk formation in two dimensions, which turns out to be a critical upgrade over older collapse models. We predict chemical stratification in the disk due to different physical conditions encountered along different streamlines. We argue that the disk-envelope accretion shock does not play a significant role for the material in the disk at the end of the collapse phase. Finally, our model suggests that complex organic species are formed on the grain surfaces at temperatures of 20 to 40 K, rather than in the gas phase in the T > 100 K hot corino.

Keywords

astrochemistry – stars: formation – circumstellar matter – planetary systems: protoplanetary disks – molecular processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S280: The Molecular Universe , June 2011 , pp. 138 - 148
Copyright
Copyright © International Astronomical Union 2011

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